@Book{xie2015,
  title = {Dynamic Documents with {R} and knitr},
  author = {Yihui Xie},
  publisher = {Chapman and Hall/CRC},
  address = {Boca Raton, Florida},
  year = {2015},
  edition = {2nd},
  note = {ISBN 978-1498716963},
  url = {http://yihui.name/knitr/},
}

@Blog{SMK_pair,
  title = {Deal with paired samples for snakemake},
  author = {Tommy Tang},
  publisher = {Diving into Genetics and Genomics (blog)},
  url = {http://crazyhottommy.blogspot.com/2016/06/how-to-deal-with-paired-samples-for.html},
}

@Blog{dict_wildcards,
  title = {Use wildcards as key of a dict object},
  author = {Hanfei Sun},
  publisher = {Snakemake  Issues},
  url = {https://bitbucket.org/snakemake/snakemake/issues/7/use-wildcards-as-key-of-a-dict-object},
}